Air inlet check
After maintenance it's regulation to check the air inlet of the gasturbine.
Just to make sure no foreign objects are present or forgotten.
A small bolt can destroy a complete gasturbine.....
Here we are at the part behind the inletfilters.
Martin is standing near the implosion hatches.
When the filters are saturated with dirt (or water because of fog) these hatches open to prevent the filters from being torn apart and being drawn into the gasturbine.
That would be a disaster too!